Gregory Deis

Greg Deis is a former Assistant US Attorney who currently serves as global co-chair of Mayer Brown's Global Investigations & White Collar Defense practice and co-leader of Mayer Brown’s Litigation & Dispute Resolution Practice in Chicago. Greg regularly represents clients in high-stakes criminal and regulatory investigations and complex civil litigation. A Fellow of the American College of Trial Lawyers, Greg is a seasoned trial lawyer, having served as lead trial counsel in numerous civil and criminal trials and arbitrations.

Greg regularly represents corporate and individual clients in investigations led by the US Department of Justice, the US Securities and Exchange Commission, the Commodity Futures Trading Commission, state attorneys general and other US and foreign regulators. These matters have involved various areas of the law, including the FCPA and domestic corruption statutes, federal securities laws, US sanctions, the False Claims Act, antitrust, customs, tax, money laundering and environmental offenses. Greg also counsels clients on ethics and compliance programs, including M&A due diligence.

Greg's complex litigation experience focuses on trial work and includes cases involving class actions, RICO, the Sherman Act, federal and state securities law, the Lanham Act, products liability, accounting malpractice, breach of contract, BIPA, tortious interference with contract and environmental law.